<?php
/**
 * Created by PhpStorm.
 * User: Administrator
 * Date: 2018/4/24
 * Time: 11:29
 */

namespace WebApp\lib\email;

/**
 * Class Email
 * @package WebApp\lib\email
 */
class Email
{
    /* Public Variables */

    public $smtp_port;

    public $time_out;

    public $host_name;

    public $log_file;

    public $relay_host;

    public $debug;

    public $auth;

    public $user;

    public $pass;

    /* Private Variables */
    public $sock;

    /* Constractor */

    /**
     * Email constructor.
     * @param string $relay_host
     * @param int $smtp_port
     * @param bool $auth
     * @param $user
     * @param $pass
     */
    public function __construct($relay_host = "", $smtp_port = 25, $auth = false, $user, $pass)
    {
        $this->debug = false;

        $this->smtp_port = $smtp_port;

        $this->relay_host = $relay_host;

        $this->time_out = 30; //is used in fsockopen()
        #

        $this->auth = $auth;//auth

        $this->user = $user;

        $this->pass = $pass;

        #

        $this->host_name = "localhost"; //is used in HELO command
        $this->log_file = "";

        $this->sock = false;
    }

    /* Main Function */

    /**
     * @param $to
     * @param $from
     * @param string $subject
     * @param string $body
     * @param $mailtype
     * @param string $cc
     * @param string $bcc
     * @param string $additional_headers
     * @return bool
     */
    public function sendmail($to, $from, $subject = "", $body = "", $mailtype, $cc = "", $bcc = "", $additional_headers = "")
    {
        $mail_from = $this->get_address($this->strip_comment($from));

        $body = preg_replace("/(^|(\r\n))(\.)/", "\1.\3", $body);

        var_dump($body);

        $header = "MIME-Version:1.0\r\n";

        if ($mailtype == "HTML") {
            $header .= "Content-Type:text/html\r\n";
        }

        $header .= "To: " . $to . "\r\n";

        if ($cc != "") {
            $header .= "Cc: " . $cc . "\r\n";
        }

        $header .= "From: $from<" . $from . ">\r\n";

        $header .= "Subject: " . $subject . "\r\n";

        $header .= $additional_headers;

        $header .= "Date: " . date("r") . "\r\n";

        $header .= "X-Mailer:By Redhat (PHP/" . phpversion() . ")\r\n";

        list($msec, $sec) = explode(" ", microtime());

        $header .= "Message-ID: <" . date("YmdHis", $sec) . "." . ($msec * 1000000) . "." . $mail_from . ">\r\n";

        $TO = explode(",", $this->strip_comment($to));

        if ($cc != "") {
            $TO = array_merge($TO, explode(",", $this->strip_comment($cc)));
        }

        if ($bcc != "") {
            $TO = array_merge($TO, explode(",", $this->strip_comment($bcc)));
        }

        $sent = true;

        foreach ($TO as $rcpt_to) {
            $rcpt_to = $this->get_address($rcpt_to);

            if (!$this->smtp_sockopen($rcpt_to)) {
                $this->log_write("Error: Cannot send email to " . $rcpt_to . "\n");

                $sent = false;

                continue;
            }

            if ($this->smtp_send($this->host_name, $mail_from, $rcpt_to, $header, $body)) {
                $this->log_write("E-mail has been sent to <" . $rcpt_to . ">\n");
            } else {
                $this->log_write("Error: Cannot send email to <" . $rcpt_to . ">\n");

                $sent = false;
            }

            fclose($this->sock);

            $this->log_write("Disconnected from remote host\n");
        }

        return $sent;
    }

    /* Private Functions */

    public function smtp_send($helo, $from, $to, $header, $body = "")
    {
        if (!$this->smtp_putcmd("HELO", $helo)) {
            return $this->smtp_error("sending HELO command");
        }

        #auth

        if ($this->auth) {
            if (!$this->smtp_putcmd("AUTH LOGIN", base64_encode($this->user))) {
                return $this->smtp_error("sending HELO command");
            }

            if (!$this->smtp_putcmd("", base64_encode($this->pass))) {
                return $this->smtp_error("sending HELO command");
            }
        }

        #

        if (!$this->smtp_putcmd("MAIL", "FROM:<" . $from . ">")) {
            return $this->smtp_error("sending MAIL FROM command");
        }

        if (!$this->smtp_putcmd("RCPT", "TO:<" . $to . ">")) {
            return $this->smtp_error("sending RCPT TO command");
        }

        if (!$this->smtp_putcmd("DATA")) {
            return $this->smtp_error("sending DATA command");
        }

        if (!$this->smtp_message($header, $body)) {
            return $this->smtp_error("sending message");
        }

        if (!$this->smtp_eom()) {
            return $this->smtp_error("sending <CR><LF>.<CR><LF> [EOM]");
        }

        if (!$this->smtp_putcmd("QUIT")) {
            return $this->smtp_error("sending QUIT command");
        }

        return true;
    }

    public function smtp_sockopen($address)
    {
        if ($this->relay_host == "") {
            return $this->smtp_sockopen_mx($address);
        } else {
            return $this->smtp_sockopen_relay();
        }
    }

    public function smtp_sockopen_relay()
    {
        $this->log_write("Trying to " . $this->relay_host . ":" . $this->smtp_port . "\n");

        $this->sock = @fsockopen($this->relay_host, $this->smtp_port, $errno, $errstr, $this->time_out);

        if (!($this->sock && $this->smtp_ok())) {
            $this->log_write("Error: Cannot connenct to relay host " . $this->relay_host . "\n");

            $this->log_write("Error: " . $errstr . " (" . $errno . ")\n");

            return false;
        }

        $this->log_write("Connected to relay host " . $this->relay_host . "\n");

        return true;
        ;
    }

    public function smtp_sockopen_mx($address)
    {
        $domain = preg_replace("/^.+@([^@]+)$/", "\1", $address);

        if (!@getmxrr($domain, $MXHOSTS)) {
            $this->log_write("Error: Cannot resolve MX \"" . $domain . "\"\n");

            return false;
        }
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        foreach ($MXHOSTS as $host) {
            $this->log_write("Trying to " . $host . ":" . $this->smtp_port . "\n");

            $this->sock = @fsockopen($host, $this->smtp_port, $errno, $errstr, $this->time_out);

            if (!($this->sock && $this->smtp_ok())) {
                $this->log_write("Warning: Cannot connect to mx host " . $host . "\n");

                $this->log_write("Error: " . $errstr . " (" . $errno . ")\n");

                continue;
            }

            $this->log_write("Connected to mx host " . $host . "\n");

            return true;
        }

        $this->log_write("Error: Cannot connect to any mx hosts (" . implode(", ", $MXHOSTS) . ")\n");

        return false;
    }

    public function smtp_message($header, $body)
    {
        fputs($this->sock, $header . "\r\n" . $body);

        $this->smtp_debug("> " . str_replace("\r\n", "\n" . "> ", $header . "\n> " . $body . "\n> "));

        return true;
    }

    public function smtp_eom()
    {
        fputs($this->sock, "\r\n.\r\n");

        $this->smtp_debug(". [EOM]\n");

        return $this->smtp_ok();
    }

    public function smtp_ok()
    {
        $response = str_replace("\r\n", "", fgets($this->sock, 512));

        $this->smtp_debug($response . "\n");

        if (!preg_match("/^[23]/", $response)) {
            fputs($this->sock, "QUIT\r\n");

            fgets($this->sock, 512);

            $this->log_write("Error: Remote host returned \"" . $response . "\"\n");

            return false;
        }

        return true;
    }

    public function smtp_putcmd($cmd, $arg = "")
    {
        if ($arg != "") {
            if ($cmd == "") {
                $cmd = $arg;
            } else {
                $cmd = $cmd . " " . $arg;
            }
        }

        fputs($this->sock, $cmd . "\r\n");

        $this->smtp_debug("> " . $cmd . "\n");

        return $this->smtp_ok();
    }

    public function smtp_error($string)
    {
        $this->log_write("Error: Error occurred while " . $string . ".\n");

        return false;
    }

    public function log_write($message)
    {
        $this->smtp_debug($message);

        if ($this->log_file == "") {
            return true;
        }

        $message = date("M d H:i:s ") . get_current_user() . "[" . getmypid() . "]: " . $message;

        if (!@file_exists($this->log_file) || !($fp = @fopen($this->log_file, "a"))) {
            $this->smtp_debug("Warning: Cannot open log file \"" . $this->log_file . "\"\n");

            return false;
            ;
        }

        flock($fp, LOCK_EX);

        fputs($fp, $message);

        fclose($fp);


        return true;
    }


    public function strip_comment($address)
    {
        $comment = "/\([^()]*\)/";

        while (preg_match($comment, $address)) {
            $address = preg_replace($comment, "", $address);
        }

        return $address;
    }


    public function get_address($address)
    {
        $address = preg_replace("/([ \t\r\n])+/", "", $address);

        $address = preg_replace("/^.*<(.+)>.*$/", "\1", $address);

        return $address;
    }

    public function smtp_debug($message)
    {
        if ($this->debug) {
            echo $message;
        }
    }
}
